/*
* (c) Copyright Reserved EVRYTHNG Limited 2016. All rights reserved.
* Use of this material is subject to license.
* Copying and unauthorised use of this material strictly prohibited.
*/
package com.evrythng.java.wrapper.mapping;
import com.evrythng.java.wrapper.util.JSONUtils;
import com.evrythng.thng.resource.model.store.BatchPopulatingTask;
import com.evrythng.thng.resource.model.store.ShortIdGenerationTask;
import com.evrythng.thng.resource.model.store.TaskOnBatch;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import java.io.IOException;
public final class TaskOnBatchDeserializer extends Deserializer<TaskOnBatch> {
private static final long serialVersionUID = -8949860162832769733L;
TaskOnBatchDeserializer() {
super(TaskOnBatch.class);
}
@Override
public TaskOnBatch deserialize(final JsonParser jp, final DeserializationContext ctx) throws IOException {
ObjectMapper mapper = JSONUtils.OBJECT_MAPPER;
JsonNode node = mapper.readTree(jp);
JsonNode typeNode = node.get(TaskOnBatch.FIELD_TYPE);
if (typeNode == null) {
throw new JsonMappingException("Cannot deserialize task on batch without type field");
}
String typeRaw = getFieldValue(typeNode);
Class<? extends TaskOnBatch> subtypeClass = classForType(TaskOnBatch.Type.valueOf(typeRaw.toUpperCase()));
return mapper.readValue(node.toString(), subtypeClass);
}
private Class<? extends TaskOnBatch> classForType(final TaskOnBatch.Type type) {
switch (type) {
case POPULATING:
return BatchPopulatingTask.class;
case SHORT_ID_GENERATION:
return ShortIdGenerationTask.class;
}
throw new IllegalArgumentException("Unsupported task on batch type: " + type);
}
}